Modares Mechanical Engineering

Modares Mechanical Engineering

Numerical Calculation of the Sound Produced by the Wind Flow Around the Cylinder and Correction of the Sound Amplitude by Increasing the Length

Authors
Arezoo Najafian
Hamid Parhizkar
Sajjad Ghasemlooy
Abbas Tarabi
Department of Aerospace Engineering, Malek Ashtar University, Tehran, Iran
Abstract
In the present study, the numerical solution of the Ansys Fluent software has been used to calculate the sound produced by the high-speed flow on a cylinder using the Lighthill acoustic analogy. The calculations were carried out on a cylinder (part of the landing gear) at a speed of 70 m/s (take-off and landing speeds of airliners). The problem is initially caried out as a regular unsteady numerical solution. During the solution, aerodynamic noise data sources are stored as inputs of acoustic analyzes in files. Then, by solving the acoustic equations, the volume of produced sound (in decibel) is calculated at points that are pre-defined as the microphone in the desired coordinates. The purpose of this study is to study the ability of Fluent solution to calculate the sound generated by the flow, in addition of using a method for estimating the amount of sound increase by increasing the length of the cylinder. In the other words, due to the timing of the numerical solution, one can calculate sound generated by small length cylinder, and then, using engineering approximation, it estimates the sound of the flow around the larger-length cylinder. After the necessary calculations, results are provided as sound pressure level curves using the acoustic analogy and fourier spectral analysis. The results show that large eddy simulation turbulence model is most appropriate model for acoustic simulations. Also, the approximate method for evaluating the effect of increasing the length of the cylinder is in good agreement with the experimental results.
Keywords
Aeroacoustic simulation
Ffowcs-Williams & Hawkings model
Large Eddy Simulation
Sound pressure level
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Modares Mechanical Engineering
Volume 18, Issue 3
May 2018
Pages 440-450